Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Bromine is an inorganic substance with the molecular formula Br2. Upon contact with water, volatile bromine is released, and bromine in the aqueous compartment reacts rapidly to form hydrobromic (HBr) and hypobromous acids (HOBr). These products also dissociate, such that all the various forms of halogen (free, combined, residual oxidants) will exist in an equilibrium dependent on a number of variables such as pH, temperature, concentrations, electrochemical environment, headspace, dissolved solutes, suspended materials, light wavelength and intensity, among others. Estimated log Kows for bromine are 1.03 and 1.49 (Annex VII Section 7.8), so it has a low potential for bioaccumulation. The Canadian Council of Resource and Environmental Ministers (1987) concluded for freshwater organisms, since chlorine and chloramines do not appear to have any potential for bioaccumulation or bioconcentration, it is reasonable to assume that this is probably the case for bromine and bromamines.